Question about topping off my oil.

kissfan79 · **Posted:** Fri Dec 30, 2011 1:17 am

Hey guys....
My oil is a little low and I need to add some. I have been running Mobil 1 0w-40 but all the Wal-marts I went to today were sold out. I did pick up some Mobil 1 5w-40 turbo diesel truck oil. Will it cause any issues to add 1/4-1/2 quart of this to the 0w-40 already in there? Also....even though the manual states to use the 0w-40....is it better to run the 5-w-40tdt oil?

Thanks, Jim

Hoosier CRD · **Posted:** Fri Dec 30, 2011 5:58 am

Short answer is: It depends!

How low is the oil on the stick? If it is in the crosshhatched area, i.e. between "add" and "full" then the concensus is to leave it there. Some here, much more knowledgeable than I, posit that the oil level is actually too high when at the "Full" line.

As far as viscosity goes, I think that the 5W-40 is fine. Personally, I use Amsoil, the Eurospec 5W-40 diesel oil. It works wonderfully, has excellent flow characteristics in low temps. It is also rated with the MS10725 spec., something that is very important.

Finally, I use the Mopar oil filter, P/N 05072720AA. Others will posit that the Wix filters, etc are good and they are. The Mopar branded filter is made in Italy, approved by Vancini and Martelli and Mopar. The price is quite comparable to aftermarket. So, why not use it?

Hope this helps.

FWIW

Hoosier CRD

kissfan79 · **Posted:** Fri Dec 30, 2011 7:05 am

Thanks for the reply. The level on the dipstick is actually a tad below the "min" line. I wanted to add just enough to bring it up half way between the min and max lines. I just wanted to be sure that nothing funky would happen if I added to it with a slightly different viscosity.

Jim

kissfan79 · **Posted:** Fri Dec 30, 2011 7:24 am

Also.....I was just looking at Mobil 1's website and it didn't say it was rated with the MS10725 specification.

cerich · **Posted:** Fri Dec 30, 2011 12:22 pm

next oil change add 6.5 qts and scratch the dipstick. Never fill beyond that level or you engine (intercooler actually) will eat the oil and eventually you will break it...

try that, the dipsticks are wrong on our crd's. when I bought new in 2005 I had that problem and there was a note in Chryslers system on it...

ATXKJ · **Posted:** Fri Dec 30, 2011 9:15 pm

to the original point - there's no problem mixing 5-40 and 0-40.

however most CRD's tend to stabilize slightly above the 'min' line - more than that blows into the Provent (or EHM, or intake manifold ect,ect)

geordi · **Posted:** Fri Dec 30, 2011 10:11 pm

Mobil 1 0w40? What is the API service grade on the back of that? I would bet money that it is NOT the right oil, even though it seems like the right viscosity rating. 99% of the oils out there are not proper for diesel use, they cannot handle the soot overload.

Mobil 1 Turbo Diesel Truck 5w40 is the correct oil, as is Mobil 1 Delvac Synthetic (silver bottle, NOT Delvac 1300) from a truck stop... Both those are the same product actually, just different packaging. OR Shell Rotella T synthetic, which might be cheaper at WalMart.

We need API service grades of CH-4 or higher for our engines, most gas oils are only CF rated, and the ratings follow the alphabet. C is for compression (S spark) and then F is less than F4 or G, G is less than H or I or J. Higher ratings can always work for lesser-rated engines, so a CJ-4 oil is perfect for our engines.

jeepdan · **Posted:** Fri Dec 30, 2011 10:45 pm

kissfan79 wrote:

Also.....I was just looking at Mobil 1's website and it didn't say it was rated with the MS10725 specification.

https://www.mobiloil.com/USA-English/Mo ... W-40.aspx# listed in the specifications tab.

ATXKJ · **Posted:** Sat Dec 31, 2011 8:30 am

05 Owners manual

Quote:

Engine Oil Selection (Diesel Engines)
For best performance and maximum protection for all
engines under all types of operating conditions, the
manufacturer recommends using synthetic engine oils
that are API Certified (SL/CF), and meet the requirements
of DaimlerChrysler Material Standard MS-10725.
Engine Oil Viscosity (2.8L Diesel Engines)
Use SAE 0W-40 Mobil 1 Synthetic Engine Oil that
meets API categories CF or better and the requirements
of DaimlerChrysler Material Standard MS-10725. If you
cannot find SAE 0W-40, then SAE 5W-40 Mobil 1
Synthetic Engine Oil is acceptable. Any engine oil that
does not meet the manufacturer’s requirements should
not be used.
......
MAINTAINING YOUR VEHICLE 315

They came with 0-40

nissanfrontier · **Joined:** Tue Dec 22, 2009 4:09 pm **Posts:** 145

I have been finding MOPAR italian filter has been leaking on my jeep well last 2 $15 filters I purchased. In an emergency I grabbed regular dino oil and put quart in jeep. For some reason my jeep liked seemed to like the oil? Turbo sounded little better. Maybe the seals and stuff expanded.

geordi · **Posted:** Mon Jan 02, 2012 12:24 am

Impossible to have anything in the turbo "expand" as there is no rubber seal anywhere holding the oil in. There is too much heat where the oil actually is, it is retained by bearings and disc seals (metal on metal) only. The only rubber gasket is on the intake side, and while I don't know exactly what its purpose is, it is between the oil seal and the top cover, and was clean and dry on my turbo after 60k+ miles of operation.

Dino oil is no good for our engines and especially the turbo - the passages are far too small and if there is any clotting of the oil, those passages will plug and the turbo will die shortly after. Dino oil in there can and will turn to cooked sludge b/c the tolerances and heat are FAR too intense.

I can understand it in a pinch to protect things, but you will want to do a full oil change soon to protect against damage.

For oil filters, look for the Mobil One M1-301 filter. It is not listed as a compatible filter in the book, but it is. It is a slightly larger size, and will account for about another .5 quarts in an oil change, so the correct fill with that filter will be 7 quarts.

papaindigo · **Posted:** Mon Jan 02, 2012 10:01 am

WIX oil filter 51515 is another oversize option that rounds a full fill up to 7qts even.

kissfan79 · **Posted:** Tue Jan 03, 2012 12:43 pm

JeepDan.....when I made the statement about the Mobil 1 not listing the Chrysler specification....I was referring to the 5w-40 TDT oil. I knew the 0w-40 did.

To all......Is it better to run the 5w-40TDT from Mobil 1 rather than the 0w-40 even though it does not list the MS-10725 spec? The reason im trying to find out (besides just taking the best care possible of my CRD

) is because I sometimes tow a 4,000 pound concesssion trailer with my Jeep and was wondering if the 5w-40TDT oil would offer better proctection because of towing the trailer.

On a side note.....I'm getting ready to send some oil off to Blackstone labs for a UOA to see how it looks....especially after that split boost hose I had last month. I'm really cusious as to the results.

Thanks, Jim

papaindigo · **Posted:** Tue Jan 03, 2012 12:58 pm

kissfan79 - I may have my terms wrong but for your towing purpose it really doesn't matter which xW-40 oil you use, correct oil specs for the engine are more important.

As I understand it the upper #, in this case 40, refers to oil performance/viscosity/whatever at 210F or more or less average engine operating temp while the xW # refers to cold temp (don't ask me what temp but I assume it's an industry standard temp) performance/viscosity/whatever.

Bottom line if you are concerned about cold cranking look at the xW # but if you are interested in high temp performance look at the high #. In other words any oil rated xW-40 or straight 40 will perform the same at regular engine operating temps. NOTE - this is a vast improvement from the old days of just straight weight oil where in warm weather everyone ran straight 30w and in the winter had to figure out what straight weight oil would not be too thick for a cold engine to crank at least if the engine cranked the oil would move enough to protect bearing surfaces while at the same time not being too thin when the engine warmed up.

Keep in mind that a "higher" high number is not better. Engine oil typically tops out at 30 or 40; you don't want to run 90 in the engine as it won't properly flow.

kissfan79 · **Posted:** Tue Jan 03, 2012 1:17 pm

Gotcha'....thanks. So.....in a climate where it doesn't get consistently cold cold it wouldn't really matter to run a 0w vs a 5w 40 correct?

Jim

geordi · **Posted:** Tue Jan 03, 2012 3:25 pm

No, it wouldn't matter between 0W and 5W... I believe the conversion temperature is somewhere below 0 degrees F anyway, and if Raleigh gets that cold, its time to move the South a lot further South!

I run the Mobil 1 Delvac 5w-40 all year, or the Mobil 1 TDT 5w-40 (Its the exact same stuff, just different packaging) or the Shell Rotella T Synthetic in either 5w40 or 0w40 depending on what Walmart has. You will be fine with all of these, as it will be the same 40 weight oil after the engine warms up for a few seconds.

If you are concerned about it, add a couple minutes of idling in the driveway before you drive off, OR set up an outdoor timer and use the block heater cable for 2 hours before you expect to leave in the morning.

Why did my first turbo fail? It was 25 overnight that night, 32 when I left... And I had neither the block heater nor time to warm up the engine. I *may* not have had the correct oil, I can't remember so I can't say for certain. But I believe the turbo did not get enough lubrication and the bearing seized. If you experience any kind of sudden power loss, shut the motor off ASAP and check the intake hoses. If they aren't torn, then you may have just saved your engine.

Question about topping off my oil.

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